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From: Rik van Riel on 14 Jun 2010 13:40
On 06/14/2010 07:17 AM, Mel Gorman wrote:
> This patch adds a trace event for when page reclaim queues a page for IO and
> records whether it is synchronous or asynchronous. Excessive synchronous
> IO for a process can result in noticeable stalls during direct reclaim.
> Excessive IO from page reclaim may indicate that the system is seriously
> under provisioned for the amount of dirty pages that exist.
>
> Signed-off-by: Mel Gorman<mel(a)csn.ul.ie>

Acked-by: Rik van Riel <riel(a)redhat.com>

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